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September Weather in Iwaki, Japan

Last updated: August 23, 2025

In September, the average temperature in Iwaki, Japan is a pleasant 22°C (72°F). Expect minimums of 15°C (60°F) and highs reaching up to 29°C (84°F). Be prepared for 186 mm (7.3 in) of precipitation spread over 16 days, contributing to an average humidity level of 84%.

September Temperature in Iwaki

In September in Iwaki, the average temperature is 22°C (72°F). Maximum temperatures can reach 29°C (84°F), while minimum temperatures can drop to as low as 15°C (60°F). This pleasant climate makes it an ideal time for travelers to enjoy outdoor activities and explore the attractions of Iwaki.

September Weather in Iwaki: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Iwaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwaki, September typically has an average temperature of 22°C (72°F), with highs reaching up to 29°C (84°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec414247536166727671645546
Data source: Temperature data for Iwaki generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Iwaki

In Iwaki in September, the precipitation amount is 186 mm (7.3 in) over the course of 16 days.

September Precipitation Trends in Iwaki

The chart displays monthly precipitation patterns in Iwaki, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Iwaki, September typically receives around 186 mm (7.3 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec57451691361541362021371862718573
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Iwaki

In Iwaki in September humidity is 84%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel feel slightly stifling but also lending a vibrant energy to the atmosphere, which can be both invigorating and tiring as you explore.

September Average Humidity in Iwaki

This chart illustrates the average monthly humidity levels in Iwaki, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Iwaki is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Iwaki

In Iwaki in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Iwaki.

Maximum UV Index Levels in Iwaki for September

The chart shows the monthly maximum UV Index (UVI) for Iwaki in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Iwaki typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011119653
Data source: Iwaki September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Iwaki Compares to Other Months

Weather in Iwaki varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Iwaki, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Iwaki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)57 mm (2.2 inches)76%moderate
February Weather6°C (42°F)45 mm (1.8 inches)75%moderate
March Weather8°C (47°F)169 mm (6.6 inches)72%high
April Weather11°C (53°F)136 mm (5.4 inches)73%very high
May Weather16°C (61°F)154 mm (6.1 inches)80%very high
June Weather19°C (66°F)136 mm (5.3 inches)87%very high
July Weather22°C (72°F)202 mm (8.0 inches)92%extreme
August Weather25°C (76°F)137 mm (5.4 inches)90%extreme
September Weather22°C (72°F)186 mm (7.3 inches)84%very high
October Weather18°C (64°F)271 mm (10.7 inches)80%high
November Weather13°C (55°F)85 mm (3.4 inches)77%moderate
December Weather8°C (46°F)73 mm (2.9 inches)77%moderate

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